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/*
* libjingle
* Copyright 2012, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "talk/app/webrtc/webrtcsession.h"
#include <algorithm>
#include <climits>
#include <vector>
#include "talk/app/webrtc/jsepicecandidate.h"
#include "talk/app/webrtc/jsepsessiondescription.h"
#include "talk/app/webrtc/mediaconstraintsinterface.h"
#include "talk/app/webrtc/mediastreamsignaling.h"
#include "talk/app/webrtc/peerconnectioninterface.h"
#include "talk/app/webrtc/webrtcsessiondescriptionfactory.h"
#include "talk/base/helpers.h"
#include "talk/base/logging.h"
#include "talk/base/stringencode.h"
#include "talk/media/base/constants.h"
#include "talk/media/base/videocapturer.h"
#include "talk/session/media/channel.h"
#include "talk/session/media/channelmanager.h"
#include "talk/session/media/mediasession.h"
using cricket::ContentInfo;
using cricket::ContentInfos;
using cricket::MediaContentDescription;
using cricket::SessionDescription;
using cricket::TransportInfo;
namespace webrtc {
const char kInternalConstraintPrefix[] = "internal";
// Supported MediaConstraints.
// DTLS-SRTP pseudo-constraints.
const char MediaConstraintsInterface::kEnableDtlsSrtp[] =
"DtlsSrtpKeyAgreement";
// DataChannel pseudo constraints.
const char MediaConstraintsInterface::kEnableRtpDataChannels[] =
"RtpDataChannels";
// This constraint is for internal use only, representing the Chrome command
// line flag. So it is prefixed with kInternalConstraintPrefix so JS values
// will be removed.
const char MediaConstraintsInterface::kEnableSctpDataChannels[] =
"internalSctpDataChannels";
// Error messages
const char kSetLocalSdpFailed[] = "SetLocalDescription failed: ";
const char kSetRemoteSdpFailed[] = "SetRemoteDescription failed: ";
const char kCreateChannelFailed[] = "Failed to create channels.";
const char kBundleWithoutRtcpMux[] = "RTCP-MUX must be enabled when BUNDLE "
"is enabled.";
const char kInvalidCandidates[] = "Description contains invalid candidates.";
const char kInvalidSdp[] = "Invalid session description.";
const char kMlineMismatch[] =
"Offer and answer descriptions m-lines are not matching. "
"Rejecting answer.";
const char kSdpWithoutCrypto[] = "Called with a SDP without crypto enabled.";
const char kSessionError[] = "Session error code: ";
const char kUpdateStateFailed[] = "Failed to update session state: ";
const char kPushDownOfferTDFailed[] =
"Failed to push down offer transport description.";
const char kPushDownPranswerTDFailed[] =
"Failed to push down pranswer transport description.";
const char kPushDownAnswerTDFailed[] =
"Failed to push down answer transport description.";
// Compares |answer| against |offer|. Comparision is done
// for number of m-lines in answer against offer. If matches true will be
// returned otherwise false.
static bool VerifyMediaDescriptions(
const SessionDescription* answer, const SessionDescription* offer) {
if (offer->contents().size() != answer->contents().size())
return false;
for (size_t i = 0; i < offer->contents().size(); ++i) {
if ((offer->contents()[i].name) != answer->contents()[i].name) {
return false;
}
}
return true;
}
// Checks that each non-rejected content has SDES crypto keys or a DTLS
// fingerprint. Mismatches, such as replying with a DTLS fingerprint to SDES
// keys, will be caught in Transport negotiation, and backstopped by Channel's
// |secure_required| check.
static bool VerifyCrypto(const SessionDescription* desc) {
if (!desc) {
return false;
}
const ContentInfos& contents = desc->contents();
for (size_t index = 0; index < contents.size(); ++index) {
const ContentInfo* cinfo = &contents[index];
if (cinfo->rejected) {
continue;
}
// If the content isn't rejected, crypto must be present.
const MediaContentDescription* media =
static_cast<const MediaContentDescription*>(cinfo->description);
const TransportInfo* tinfo = desc->GetTransportInfoByName(cinfo->name);
if (!media || !tinfo) {
// Something is not right.
LOG(LS_ERROR) << kInvalidSdp;
return false;
}
if (media->cryptos().empty() &&
!tinfo->description.identity_fingerprint) {
// Crypto must be supplied.
LOG(LS_WARNING) << "Session description must have SDES or DTLS-SRTP.";
return false;
}
}
return true;
}
// Forces |sdesc->crypto_required| to the appropriate state based on the
// current security policy, to ensure a failure occurs if there is an error
// in crypto negotiation.
// Called when processing the local session description.
static void UpdateSessionDescriptionSecurePolicy(
cricket::SecureMediaPolicy secure_policy,
SessionDescription* sdesc) {
if (!sdesc) {
return;
}
// Updating the |crypto_required_| in MediaContentDescription to the
// appropriate state based on the current security policy.
for (cricket::ContentInfos::iterator iter = sdesc->contents().begin();
iter != sdesc->contents().end(); ++iter) {
if (cricket::IsMediaContent(&*iter)) {
MediaContentDescription* mdesc =
static_cast<MediaContentDescription*> (iter->description);
if (mdesc) {
mdesc->set_crypto_required(secure_policy == cricket::SEC_REQUIRED);
}
}
}
}
static bool GetAudioSsrcByTrackId(
const SessionDescription* session_description,
const std::string& track_id, uint32 *ssrc) {
const cricket::ContentInfo* audio_info =
cricket::GetFirstAudioContent(session_description);
if (!audio_info) {
LOG(LS_ERROR) << "Audio not used in this call";
return false;
}
const cricket::MediaContentDescription* audio_content =
static_cast<const cricket::MediaContentDescription*>(
audio_info->description);
cricket::StreamParams stream;
if (!cricket::GetStreamByIds(audio_content->streams(), "", track_id,
&stream)) {
return false;
}
*ssrc = stream.first_ssrc();
return true;
}
static bool GetTrackIdBySsrc(const SessionDescription* session_description,
uint32 ssrc, std::string* track_id) {
ASSERT(track_id != NULL);
cricket::StreamParams stream_out;
const cricket::ContentInfo* audio_info =
cricket::GetFirstAudioContent(session_description);
if (!audio_info) {
return false;
}
const cricket::MediaContentDescription* audio_content =
static_cast<const cricket::MediaContentDescription*>(
audio_info->description);
if (cricket::GetStreamBySsrc(audio_content->streams(), ssrc, &stream_out)) {
*track_id = stream_out.id;
return true;
}
const cricket::ContentInfo* video_info =
cricket::GetFirstVideoContent(session_description);
if (!video_info) {
return false;
}
const cricket::MediaContentDescription* video_content =
static_cast<const cricket::MediaContentDescription*>(
video_info->description);
if (cricket::GetStreamBySsrc(video_content->streams(), ssrc, &stream_out)) {
*track_id = stream_out.id;
return true;
}
return false;
}
static bool BadSdp(const std::string& desc, std::string* err_desc) {
if (err_desc) {
*err_desc = desc;
}
LOG(LS_ERROR) << desc;
return false;
}
static bool BadLocalSdp(const std::string& desc, std::string* err_desc) {
std::string set_local_sdp_failed = kSetLocalSdpFailed;
set_local_sdp_failed.append(desc);
return BadSdp(set_local_sdp_failed, err_desc);
}
static bool BadRemoteSdp(const std::string& desc, std::string* err_desc) {
std::string set_remote_sdp_failed = kSetRemoteSdpFailed;
set_remote_sdp_failed.append(desc);
return BadSdp(set_remote_sdp_failed, err_desc);
}
static bool BadSdp(cricket::ContentSource source,
const std::string& desc, std::string* err_desc) {
if (source == cricket::CS_LOCAL) {
return BadLocalSdp(desc, err_desc);
} else {
return BadRemoteSdp(desc, err_desc);
}
}
static std::string SessionErrorMsg(cricket::BaseSession::Error error) {
std::ostringstream desc;
desc << kSessionError << error;
return desc.str();
}
#define GET_STRING_OF_STATE(state) \
case cricket::BaseSession::state: \
result = #state; \
break;
static std::string GetStateString(cricket::BaseSession::State state) {
std::string result;
switch (state) {
GET_STRING_OF_STATE(STATE_INIT)
GET_STRING_OF_STATE(STATE_SENTINITIATE)
GET_STRING_OF_STATE(STATE_RECEIVEDINITIATE)
GET_STRING_OF_STATE(STATE_SENTPRACCEPT)
GET_STRING_OF_STATE(STATE_SENTACCEPT)
GET_STRING_OF_STATE(STATE_RECEIVEDPRACCEPT)
GET_STRING_OF_STATE(STATE_RECEIVEDACCEPT)
GET_STRING_OF_STATE(STATE_SENTMODIFY)
GET_STRING_OF_STATE(STATE_RECEIVEDMODIFY)
GET_STRING_OF_STATE(STATE_SENTREJECT)
GET_STRING_OF_STATE(STATE_RECEIVEDREJECT)
GET_STRING_OF_STATE(STATE_SENTREDIRECT)
GET_STRING_OF_STATE(STATE_SENTTERMINATE)
GET_STRING_OF_STATE(STATE_RECEIVEDTERMINATE)
GET_STRING_OF_STATE(STATE_INPROGRESS)
GET_STRING_OF_STATE(STATE_DEINIT)
default:
ASSERT(false);
break;
}
return result;
}
#define GET_STRING_OF_ERROR(err) \
case cricket::BaseSession::err: \
result = #err; \
break;
static std::string GetErrorString(cricket::BaseSession::Error err) {
std::string result;
switch (err) {
GET_STRING_OF_ERROR(ERROR_NONE)
GET_STRING_OF_ERROR(ERROR_TIME)
GET_STRING_OF_ERROR(ERROR_RESPONSE)
GET_STRING_OF_ERROR(ERROR_NETWORK)
GET_STRING_OF_ERROR(ERROR_CONTENT)
GET_STRING_OF_ERROR(ERROR_TRANSPORT)
default:
ASSERT(false);
break;
}
return result;
}
static bool SetSessionStateFailed(cricket::ContentSource source,
cricket::BaseSession::Error err,
std::string* err_desc) {
std::string set_state_err = kUpdateStateFailed;
set_state_err.append(GetErrorString(err));
return BadSdp(source, set_state_err, err_desc);
}
// Help class used to remember if a a remote peer has requested ice restart by
// by sending a description with new ice ufrag and password.
class IceRestartAnswerLatch {
public:
IceRestartAnswerLatch() : ice_restart_(false) { }
// Returns true if CheckForRemoteIceRestart has been called with a new session
// description where ice password and ufrag has changed since last time
// Reset() was called.
bool Get() const {
return ice_restart_;
}
void Reset() {
if (ice_restart_) {
ice_restart_ = false;
}
}
void CheckForRemoteIceRestart(
const SessionDescriptionInterface* old_desc,
const SessionDescriptionInterface* new_desc) {
if (!old_desc || new_desc->type() != SessionDescriptionInterface::kOffer) {
return;
}
const SessionDescription* new_sd = new_desc->description();
const SessionDescription* old_sd = old_desc->description();
const ContentInfos& contents = new_sd->contents();
for (size_t index = 0; index < contents.size(); ++index) {
const ContentInfo* cinfo = &contents[index];
if (cinfo->rejected) {
continue;
}
// If the content isn't rejected, check if ufrag and password has
// changed.
const cricket::TransportDescription* new_transport_desc =
new_sd->GetTransportDescriptionByName(cinfo->name);
const cricket::TransportDescription* old_transport_desc =
old_sd->GetTransportDescriptionByName(cinfo->name);
if (!new_transport_desc || !old_transport_desc) {
// No transport description exist. This is not an ice restart.
continue;
}
if (new_transport_desc->ice_pwd != old_transport_desc->ice_pwd &&
new_transport_desc->ice_ufrag != old_transport_desc->ice_ufrag) {
LOG(LS_INFO) << "Remote peer request ice restart.";
ice_restart_ = true;
break;
}
}
}
private:
bool ice_restart_;
};
WebRtcSession::WebRtcSession(
cricket::ChannelManager* channel_manager,
talk_base::Thread* signaling_thread,
talk_base::Thread* worker_thread,
cricket::PortAllocator* port_allocator,
MediaStreamSignaling* mediastream_signaling)
: cricket::BaseSession(signaling_thread, worker_thread, port_allocator,
talk_base::ToString(talk_base::CreateRandomId64() &
LLONG_MAX),
cricket::NS_JINGLE_RTP, false),
// RFC 3264: The numeric value of the session id and version in the
// o line MUST be representable with a "64 bit signed integer".
// Due to this constraint session id |sid_| is max limited to LLONG_MAX.
channel_manager_(channel_manager),
mediastream_signaling_(mediastream_signaling),
ice_observer_(NULL),
ice_connection_state_(PeerConnectionInterface::kIceConnectionNew),
older_version_remote_peer_(false),
data_channel_type_(cricket::DCT_NONE),
ice_restart_latch_(new IceRestartAnswerLatch) {
}
WebRtcSession::~WebRtcSession() {
if (voice_channel_.get()) {
SignalVoiceChannelDestroyed();
channel_manager_->DestroyVoiceChannel(voice_channel_.release());
}
if (video_channel_.get()) {
SignalVideoChannelDestroyed();
channel_manager_->DestroyVideoChannel(video_channel_.release());
}
if (data_channel_.get()) {
SignalDataChannelDestroyed();
channel_manager_->DestroyDataChannel(data_channel_.release());
}
for (size_t i = 0; i < saved_candidates_.size(); ++i) {
delete saved_candidates_[i];
}
delete identity();
}
bool WebRtcSession::Initialize(
const MediaConstraintsInterface* constraints,
DTLSIdentityServiceInterface* dtls_identity_service) {
// TODO(perkj): Take |constraints| into consideration. Return false if not all
// mandatory constraints can be fulfilled. Note that |constraints|
// can be null.
bool value;
// Enable creation of RTP data channels if the kEnableRtpDataChannels is set.
// It takes precendence over the kEnableSctpDataChannels constraint.
if (FindConstraint(
constraints, MediaConstraintsInterface::kEnableRtpDataChannels,
&value, NULL) && value) {
LOG(LS_INFO) << "Allowing RTP data engine.";
data_channel_type_ = cricket::DCT_RTP;
} else {
bool sctp_enabled = FindConstraint(
constraints,
MediaConstraintsInterface::kEnableSctpDataChannels,
&value, NULL) && value;
bool dtls_enabled = FindConstraint(
constraints,
MediaConstraintsInterface::kEnableDtlsSrtp,
&value, NULL) && value;
// DTLS has to be enabled to use SCTP.
if (sctp_enabled && dtls_enabled) {
LOG(LS_INFO) << "Allowing SCTP data engine.";
data_channel_type_ = cricket::DCT_SCTP;
}
}
if (data_channel_type_ != cricket::DCT_NONE) {
mediastream_signaling_->SetDataChannelFactory(this);
}
const cricket::VideoCodec default_codec(
JsepSessionDescription::kDefaultVideoCodecId,
JsepSessionDescription::kDefaultVideoCodecName,
JsepSessionDescription::kMaxVideoCodecWidth,
JsepSessionDescription::kMaxVideoCodecHeight,
JsepSessionDescription::kDefaultVideoCodecFramerate,
JsepSessionDescription::kDefaultVideoCodecPreference);
channel_manager_->SetDefaultVideoEncoderConfig(
cricket::VideoEncoderConfig(default_codec));
webrtc_session_desc_factory_.reset(new WebRtcSessionDescriptionFactory(
signaling_thread(),
channel_manager_,
mediastream_signaling_,
dtls_identity_service,
this,
id(),
data_channel_type_,
constraints));
webrtc_session_desc_factory_->SignalIdentityReady.connect(
this, &WebRtcSession::OnIdentityReady);
return true;
}
void WebRtcSession::Terminate() {
SetState(STATE_RECEIVEDTERMINATE);
RemoveUnusedChannelsAndTransports(NULL);
ASSERT(voice_channel_.get() == NULL);
ASSERT(video_channel_.get() == NULL);
ASSERT(data_channel_.get() == NULL);
}
bool WebRtcSession::StartCandidatesAllocation() {
// SpeculativelyConnectTransportChannels, will call ConnectChannels method
// from TransportProxy to start gathering ice candidates.
SpeculativelyConnectAllTransportChannels();
if (!saved_candidates_.empty()) {
// If there are saved candidates which arrived before local description is
// set, copy those to remote description.
CopySavedCandidates(remote_desc_.get());
}
// Push remote candidates present in remote description to transport channels.
UseCandidatesInSessionDescription(remote_desc_.get());
return true;
}
void WebRtcSession::set_secure_policy(
cricket::SecureMediaPolicy secure_policy) {
webrtc_session_desc_factory_->set_secure(secure_policy);
}
cricket::SecureMediaPolicy WebRtcSession::secure_policy() const {
return webrtc_session_desc_factory_->secure();
}
bool WebRtcSession::GetSslRole(talk_base::SSLRole* role) {
if (local_description() == NULL || remote_description() == NULL) {
LOG(LS_INFO) << "Local and Remote descriptions must be applied to get "
<< "SSL Role of the session.";
return false;
}
// TODO(mallinath) - Return role of each transport, as role may differ from
// one another.
// In current implementaion we just return the role of first transport in the
// transport map.
for (cricket::TransportMap::const_iterator iter = transport_proxies().begin();
iter != transport_proxies().end(); ++iter) {
if (iter->second->impl()) {
return iter->second->impl()->GetSslRole(role);
}
}
return false;
}
void WebRtcSession::CreateOffer(CreateSessionDescriptionObserver* observer,
const MediaConstraintsInterface* constraints) {
webrtc_session_desc_factory_->CreateOffer(observer, constraints);
}
void WebRtcSession::CreateAnswer(CreateSessionDescriptionObserver* observer,
const MediaConstraintsInterface* constraints) {
webrtc_session_desc_factory_->CreateAnswer(observer, constraints);
}
bool WebRtcSession::SetLocalDescription(SessionDescriptionInterface* desc,
std::string* err_desc) {
// Takes the ownership of |desc| regardless of the result.
talk_base::scoped_ptr<SessionDescriptionInterface> desc_temp(desc);
// Validate SDP.
if (!ValidateSessionDescription(desc, cricket::CS_LOCAL, err_desc)) {
return false;
}
// Update the initiator flag if this session is the initiator.
Action action = GetAction(desc->type());
if (state() == STATE_INIT && action == kOffer) {
set_initiator(true);
}
cricket::SecureMediaPolicy secure_policy =
webrtc_session_desc_factory_->secure();
// Update the MediaContentDescription crypto settings as per the policy set.
UpdateSessionDescriptionSecurePolicy(secure_policy, desc->description());
set_local_description(desc->description()->Copy());
local_desc_.reset(desc_temp.release());
// Transport and Media channels will be created only when offer is set.
if (action == kOffer && !CreateChannels(local_desc_->description())) {
// TODO(mallinath) - Handle CreateChannel failure, as new local description
// is applied. Restore back to old description.
return BadLocalSdp(kCreateChannelFailed, err_desc);
}
// Remove channel and transport proxies, if MediaContentDescription is
// rejected.
RemoveUnusedChannelsAndTransports(local_desc_->description());
if (!UpdateSessionState(action, cricket::CS_LOCAL,
local_desc_->description(), err_desc)) {
return false;
}
// Kick starting the ice candidates allocation.
StartCandidatesAllocation();
// Update state and SSRC of local MediaStreams and DataChannels based on the
// local session description.
mediastream_signaling_->OnLocalDescriptionChanged(local_desc_.get());
if (error() != cricket::BaseSession::ERROR_NONE) {
return BadLocalSdp(SessionErrorMsg(error()), err_desc);
}
return true;
}
bool WebRtcSession::SetRemoteDescription(SessionDescriptionInterface* desc,
std::string* err_desc) {
// Takes the ownership of |desc| regardless of the result.
talk_base::scoped_ptr<SessionDescriptionInterface> desc_temp(desc);
// Validate SDP.
if (!ValidateSessionDescription(desc, cricket::CS_REMOTE, err_desc)) {
return false;
}
// Transport and Media channels will be created only when offer is set.
Action action = GetAction(desc->type());
if (action == kOffer && !CreateChannels(desc->description())) {
// TODO(mallinath) - Handle CreateChannel failure, as new local description
// is applied. Restore back to old description.
return BadRemoteSdp(kCreateChannelFailed, err_desc);
}
// Remove channel and transport proxies, if MediaContentDescription is
// rejected.
RemoveUnusedChannelsAndTransports(desc->description());
// NOTE: Candidates allocation will be initiated only when SetLocalDescription
// is called.
set_remote_description(desc->description()->Copy());
if (!UpdateSessionState(action, cricket::CS_REMOTE,
desc->description(), err_desc)) {
return false;
}
// Update remote MediaStreams.
mediastream_signaling_->OnRemoteDescriptionChanged(desc);
if (local_description() && !UseCandidatesInSessionDescription(desc)) {
return BadRemoteSdp(kInvalidCandidates, err_desc);
}
// Copy all saved candidates.
CopySavedCandidates(desc);
// We retain all received candidates.
WebRtcSessionDescriptionFactory::CopyCandidatesFromSessionDescription(
remote_desc_.get(), desc);
// Check if this new SessionDescription contains new ice ufrag and password
// that indicates the remote peer requests ice restart.
ice_restart_latch_->CheckForRemoteIceRestart(remote_desc_.get(),
desc);
remote_desc_.reset(desc_temp.release());
if (error() != cricket::BaseSession::ERROR_NONE) {
return BadRemoteSdp(SessionErrorMsg(error()), err_desc);
}
return true;
}
bool WebRtcSession::UpdateSessionState(
Action action, cricket::ContentSource source,
const cricket::SessionDescription* desc,
std::string* err_desc) {
// If there's already a pending error then no state transition should happen.
// But all call-sites should be verifying this before calling us!
ASSERT(error() == cricket::BaseSession::ERROR_NONE);
if (action == kOffer) {
if (!PushdownTransportDescription(source, cricket::CA_OFFER)) {
return BadSdp(source, kPushDownOfferTDFailed, err_desc);
}
SetState(source == cricket::CS_LOCAL ?
STATE_SENTINITIATE : STATE_RECEIVEDINITIATE);
if (error() != cricket::BaseSession::ERROR_NONE) {
return SetSessionStateFailed(source, error(), err_desc);
}
} else if (action == kPrAnswer) {
if (!PushdownTransportDescription(source, cricket::CA_PRANSWER)) {
return BadSdp(source, kPushDownPranswerTDFailed, err_desc);
}
EnableChannels();
SetState(source == cricket::CS_LOCAL ?
STATE_SENTPRACCEPT : STATE_RECEIVEDPRACCEPT);
if (error() != cricket::BaseSession::ERROR_NONE) {
return SetSessionStateFailed(source, error(), err_desc);
}
} else if (action == kAnswer) {
if (!PushdownTransportDescription(source, cricket::CA_ANSWER)) {
return BadSdp(source, kPushDownAnswerTDFailed, err_desc);
}
MaybeEnableMuxingSupport();
EnableChannels();
SetState(source == cricket::CS_LOCAL ?
STATE_SENTACCEPT : STATE_RECEIVEDACCEPT);
if (error() != cricket::BaseSession::ERROR_NONE) {
return SetSessionStateFailed(source, error(), err_desc);
}
}
return true;
}
WebRtcSession::Action WebRtcSession::GetAction(const std::string& type) {
if (type == SessionDescriptionInterface::kOffer) {
return WebRtcSession::kOffer;
} else if (type == SessionDescriptionInterface::kPrAnswer) {
return WebRtcSession::kPrAnswer;
} else if (type == SessionDescriptionInterface::kAnswer) {
return WebRtcSession::kAnswer;
}
ASSERT(false && "unknown action type");
return WebRtcSession::kOffer;
}
bool WebRtcSession::ProcessIceMessage(const IceCandidateInterface* candidate) {
if (state() == STATE_INIT) {
LOG(LS_ERROR) << "ProcessIceMessage: ICE candidates can't be added "
<< "without any offer (local or remote) "
<< "session description.";
return false;
}
if (!candidate) {
LOG(LS_ERROR) << "ProcessIceMessage: Candidate is NULL";
return false;
}
if (!local_description() || !remote_description()) {
LOG(LS_INFO) << "ProcessIceMessage: Remote description not set, "
<< "save the candidate for later use.";
saved_candidates_.push_back(
new JsepIceCandidate(candidate->sdp_mid(), candidate->sdp_mline_index(),
candidate->candidate()));
return true;
}
// Add this candidate to the remote session description.
if (!remote_desc_->AddCandidate(candidate)) {
LOG(LS_ERROR) << "ProcessIceMessage: Candidate cannot be used";
return false;
}
return UseCandidatesInSessionDescription(remote_desc_.get());
}
bool WebRtcSession::GetTrackIdBySsrc(uint32 ssrc, std::string* id) {
if (GetLocalTrackId(ssrc, id)) {
if (GetRemoteTrackId(ssrc, id)) {
LOG(LS_WARNING) << "SSRC " << ssrc
<< " exists in both local and remote descriptions";
return true; // We return the remote track id.
}
return true;
} else {
return GetRemoteTrackId(ssrc, id);
}
}
bool WebRtcSession::GetLocalTrackId(uint32 ssrc, std::string* track_id) {
if (!BaseSession::local_description())
return false;
return webrtc::GetTrackIdBySsrc(
BaseSession::local_description(), ssrc, track_id);
}
bool WebRtcSession::GetRemoteTrackId(uint32 ssrc, std::string* track_id) {
if (!BaseSession::remote_description())
return false;
return webrtc::GetTrackIdBySsrc(
BaseSession::remote_description(), ssrc, track_id);
}
std::string WebRtcSession::BadStateErrMsg(
const std::string& type, State state) {
std::ostringstream desc;
desc << "Called with type in wrong state, "
<< "type: " << type << " state: " << GetStateString(state);
return desc.str();
}
void WebRtcSession::SetAudioPlayout(uint32 ssrc, bool enable,
cricket::AudioRenderer* renderer) {
ASSERT(signaling_thread()->IsCurrent());
if (!voice_channel_) {
LOG(LS_ERROR) << "SetAudioPlayout: No audio channel exists.";
return;
}
if (!voice_channel_->SetRemoteRenderer(ssrc, renderer)) {
// SetRenderer() can fail if the ssrc does not match any playout channel.
LOG(LS_ERROR) << "SetAudioPlayout: ssrc is incorrect: " << ssrc;
return;
}
if (!voice_channel_->SetOutputScaling(ssrc, enable ? 1 : 0, enable ? 1 : 0)) {
// Allow that SetOutputScaling fail if |enable| is false but assert
// otherwise. This in the normal case when the underlying media channel has
// already been deleted.
ASSERT(enable == false);
}
}
void WebRtcSession::SetAudioSend(uint32 ssrc, bool enable,
const cricket::AudioOptions& options,
cricket::AudioRenderer* renderer) {
ASSERT(signaling_thread()->IsCurrent());
if (!voice_channel_) {
LOG(LS_ERROR) << "SetAudioSend: No audio channel exists.";
return;
}
if (!voice_channel_->SetLocalRenderer(ssrc, renderer)) {
// SetRenderer() can fail if the ssrc does not match any send channel.
LOG(LS_ERROR) << "SetAudioSend: ssrc is incorrect: " << ssrc;
return;
}
if (!voice_channel_->MuteStream(ssrc, !enable)) {
// Allow that MuteStream fail if |enable| is false but assert otherwise.
// This in the normal case when the underlying media channel has already
// been deleted.
ASSERT(enable == false);
return;
}
if (enable)
voice_channel_->SetChannelOptions(options);
}
bool WebRtcSession::SetCaptureDevice(uint32 ssrc,
cricket::VideoCapturer* camera) {
ASSERT(signaling_thread()->IsCurrent());
if (!video_channel_.get()) {
// |video_channel_| doesnt't exist. Probably because the remote end doesnt't
// support video.
LOG(LS_WARNING) << "Video not used in this call.";
return false;
}
if (!video_channel_->SetCapturer(ssrc, camera)) {
// Allow that SetCapturer fail if |camera| is NULL but assert otherwise.
// This in the normal case when the underlying media channel has already
// been deleted.
ASSERT(camera == NULL);
return false;
}
return true;
}
void WebRtcSession::SetVideoPlayout(uint32 ssrc,
bool enable,
cricket::VideoRenderer* renderer) {
ASSERT(signaling_thread()->IsCurrent());
if (!video_channel_) {
LOG(LS_WARNING) << "SetVideoPlayout: No video channel exists.";
return;
}
if (!video_channel_->SetRenderer(ssrc, enable ? renderer : NULL)) {
// Allow that SetRenderer fail if |renderer| is NULL but assert otherwise.
// This in the normal case when the underlying media channel has already
// been deleted.
ASSERT(renderer == NULL);
}
}
void WebRtcSession::SetVideoSend(uint32 ssrc, bool enable,
const cricket::VideoOptions* options) {
ASSERT(signaling_thread()->IsCurrent());
if (!video_channel_) {
LOG(LS_WARNING) << "SetVideoSend: No video channel exists.";
return;
}
if (!video_channel_->MuteStream(ssrc, !enable)) {
// Allow that MuteStream fail if |enable| is false but assert otherwise.
// This in the normal case when the underlying media channel has already
// been deleted.
ASSERT(enable == false);
return;
}
if (enable && options)
video_channel_->SetChannelOptions(*options);
}
bool WebRtcSession::CanInsertDtmf(const std::string& track_id) {
ASSERT(signaling_thread()->IsCurrent());
if (!voice_channel_) {
LOG(LS_ERROR) << "CanInsertDtmf: No audio channel exists.";
return false;
}
uint32 send_ssrc = 0;
// The Dtmf is negotiated per channel not ssrc, so we only check if the ssrc
// exists.
if (!GetAudioSsrcByTrackId(BaseSession::local_description(), track_id,
&send_ssrc)) {
LOG(LS_ERROR) << "CanInsertDtmf: Track does not exist: " << track_id;
return false;
}
return voice_channel_->CanInsertDtmf();
}
bool WebRtcSession::InsertDtmf(const std::string& track_id,
int code, int duration) {
ASSERT(signaling_thread()->IsCurrent());
if (!voice_channel_) {
LOG(LS_ERROR) << "InsertDtmf: No audio channel exists.";
return false;
}
uint32 send_ssrc = 0;
if (!VERIFY(GetAudioSsrcByTrackId(BaseSession::local_description(),
track_id, &send_ssrc))) {
LOG(LS_ERROR) << "InsertDtmf: Track does not exist: " << track_id;
return false;
}
if (!voice_channel_->InsertDtmf(send_ssrc, code, duration,
cricket::DF_SEND)) {
LOG(LS_ERROR) << "Failed to insert DTMF to channel.";
return false;
}
return true;
}
sigslot::signal0<>* WebRtcSession::GetOnDestroyedSignal() {
return &SignalVoiceChannelDestroyed;
}
talk_base::scoped_refptr<DataChannel> WebRtcSession::CreateDataChannel(
const std::string& label,
const DataChannelInit* config) {
if (state() == STATE_RECEIVEDTERMINATE) {
return NULL;
}
if (data_channel_type_ == cricket::DCT_NONE) {
LOG(LS_ERROR) << "CreateDataChannel: Data is not supported in this call.";
return NULL;
}
DataChannelInit new_config = config ? (*config) : DataChannelInit();
if (data_channel_type_ == cricket::DCT_SCTP) {
if (new_config.id < 0) {
if (!mediastream_signaling_->AllocateSctpId(&new_config.id)) {
LOG(LS_ERROR) << "No id can be allocated for the SCTP data channel.";
return NULL;
}
} else if (!mediastream_signaling_->IsSctpIdAvailable(new_config.id)) {
LOG(LS_ERROR) << "Failed to create a SCTP data channel "
<< "because the id is already in use or out of range.";
return NULL;
}
}
talk_base::scoped_refptr<DataChannel> channel(
DataChannel::Create(this, label, &new_config));
if (channel == NULL)
return NULL;
if (!mediastream_signaling_->AddDataChannel(channel))
return NULL;
if (data_channel_type_ == cricket::DCT_SCTP) {
if (config == NULL) {
LOG(LS_WARNING) << "Could not send data channel OPEN message"
<< " because of NULL config.";
return NULL;
}
if (data_channel_.get()) {
channel->SetReceiveSsrc(new_config.id);
channel->SetSendSsrc(new_config.id);
channel->ConnectToDataSession();
}
if (!config->negotiated) {
talk_base::Buffer *payload = new talk_base::Buffer;
if (!mediastream_signaling_->WriteDataChannelOpenMessage(
label, *config, payload)) {
LOG(LS_WARNING) << "Could not write data channel OPEN message";
}
// SendControl may queue the message until the data channel's set up,
// or congestion clears.
channel->SendControl(payload);
}
}
return channel;
}
cricket::DataChannelType WebRtcSession::data_channel_type() const {
return data_channel_type_;
}
bool WebRtcSession::IceRestartPending() const {
return ice_restart_latch_->Get();
}
void WebRtcSession::ResetIceRestartLatch() {
ice_restart_latch_->Reset();
}
void WebRtcSession::OnIdentityReady(talk_base::SSLIdentity* identity) {
SetIdentity(identity);
}
bool WebRtcSession::waiting_for_identity() const {
return webrtc_session_desc_factory_->waiting_for_identity();
}
void WebRtcSession::SetIceConnectionState(
PeerConnectionInterface::IceConnectionState state) {
if (ice_connection_state_ == state) {
return;
}
// ASSERT that the requested transition is allowed. Note that
// WebRtcSession does not implement "kIceConnectionClosed" (that is handled
// within PeerConnection). This switch statement should compile away when
// ASSERTs are disabled.
switch (ice_connection_state_) {
case PeerConnectionInterface::kIceConnectionNew:
ASSERT(state == PeerConnectionInterface::kIceConnectionChecking);
break;
case PeerConnectionInterface::kIceConnectionChecking:
ASSERT(state == PeerConnectionInterface::kIceConnectionFailed ||
state == PeerConnectionInterface::kIceConnectionConnected);
break;
case PeerConnectionInterface::kIceConnectionConnected:
ASSERT(state == PeerConnectionInterface::kIceConnectionDisconnected ||
state == PeerConnectionInterface::kIceConnectionChecking ||
state == PeerConnectionInterface::kIceConnectionCompleted);
break;
case PeerConnectionInterface::kIceConnectionCompleted:
ASSERT(state == PeerConnectionInterface::kIceConnectionConnected ||
state == PeerConnectionInterface::kIceConnectionDisconnected);
break;
case PeerConnectionInterface::kIceConnectionFailed:
ASSERT(state == PeerConnectionInterface::kIceConnectionNew);
break;
case PeerConnectionInterface::kIceConnectionDisconnected:
ASSERT(state == PeerConnectionInterface::kIceConnectionChecking ||
state == PeerConnectionInterface::kIceConnectionConnected ||
state == PeerConnectionInterface::kIceConnectionCompleted ||
state == PeerConnectionInterface::kIceConnectionFailed);
break;
case PeerConnectionInterface::kIceConnectionClosed:
ASSERT(false);
break;
default:
ASSERT(false);
break;
}
ice_connection_state_ = state;
if (ice_observer_) {
ice_observer_->OnIceConnectionChange(ice_connection_state_);
}
}
void WebRtcSession::OnTransportRequestSignaling(
cricket::Transport* transport) {
ASSERT(signaling_thread()->IsCurrent());
transport->OnSignalingReady();
if (ice_observer_) {
ice_observer_->OnIceGatheringChange(
PeerConnectionInterface::kIceGatheringGathering);
}
}
void WebRtcSession::OnTransportConnecting(cricket::Transport* transport) {
ASSERT(signaling_thread()->IsCurrent());
// start monitoring for the write state of the transport.
OnTransportWritable(transport);
}
void WebRtcSession::OnTransportWritable(cricket::Transport* transport) {
ASSERT(signaling_thread()->IsCurrent());
// TODO(bemasc): Expose more API from Transport to detect when
// candidate selection starts or stops, due to success or failure.
if (transport->all_channels_writable()) {
if (ice_connection_state_ ==
PeerConnectionInterface::kIceConnectionChecking ||
ice_connection_state_ ==
PeerConnectionInterface::kIceConnectionDisconnected) {
SetIceConnectionState(PeerConnectionInterface::kIceConnectionConnected);
}
} else if (transport->HasChannels()) {
// If the current state is Connected or Completed, then there were writable
// channels but now there are not, so the next state must be Disconnected.
if (ice_connection_state_ ==
PeerConnectionInterface::kIceConnectionConnected ||
ice_connection_state_ ==
PeerConnectionInterface::kIceConnectionCompleted) {
SetIceConnectionState(
PeerConnectionInterface::kIceConnectionDisconnected);
}
}
}
void WebRtcSession::OnTransportProxyCandidatesReady(
cricket::TransportProxy* proxy, const cricket::Candidates& candidates) {
ASSERT(signaling_thread()->IsCurrent());
ProcessNewLocalCandidate(proxy->content_name(), candidates);
}
void WebRtcSession::OnCandidatesAllocationDone() {
ASSERT(signaling_thread()->IsCurrent());
if (ice_observer_) {
ice_observer_->OnIceGatheringChange(
PeerConnectionInterface::kIceGatheringComplete);
ice_observer_->OnIceComplete();
}
}
// Enabling voice and video channel.
void WebRtcSession::EnableChannels() {
if (voice_channel_ && !voice_channel_->enabled())
voice_channel_->Enable(true);
if (video_channel_ && !video_channel_->enabled())
video_channel_->Enable(true);
if (data_channel_.get() && !data_channel_->enabled())
data_channel_->Enable(true);
}
void WebRtcSession::ProcessNewLocalCandidate(
const std::string& content_name,
const cricket::Candidates& candidates) {
int sdp_mline_index;
if (!GetLocalCandidateMediaIndex(content_name, &sdp_mline_index)) {
LOG(LS_ERROR) << "ProcessNewLocalCandidate: content name "
<< content_name << " not found";
return;
}
for (cricket::Candidates::const_iterator citer = candidates.begin();
citer != candidates.end(); ++citer) {
// Use content_name as the candidate media id.
JsepIceCandidate candidate(content_name, sdp_mline_index, *citer);
if (ice_observer_) {
ice_observer_->OnIceCandidate(&candidate);
}
if (local_desc_) {
local_desc_->AddCandidate(&candidate);
}
}
}
// Returns the media index for a local ice candidate given the content name.
bool WebRtcSession::GetLocalCandidateMediaIndex(const std::string& content_name,
int* sdp_mline_index) {
if (!BaseSession::local_description() || !sdp_mline_index)
return false;
bool content_found = false;
const ContentInfos& contents = BaseSession::local_description()->contents();
for (size_t index = 0; index < contents.size(); ++index) {
if (contents[index].name == content_name) {
*sdp_mline_index = static_cast<int>(index);
content_found = true;
break;
}
}
return content_found;
}
bool WebRtcSession::UseCandidatesInSessionDescription(
const SessionDescriptionInterface* remote_desc) {
if (!remote_desc)
return true;
bool ret = true;
for (size_t m = 0; m < remote_desc->number_of_mediasections(); ++m) {
const IceCandidateCollection* candidates = remote_desc->candidates(m);
for (size_t n = 0; n < candidates->count(); ++n) {
ret = UseCandidate(candidates->at(n));
if (!ret)
break;
}
}
return ret;
}
bool WebRtcSession::UseCandidate(
const IceCandidateInterface* candidate) {
size_t mediacontent_index = static_cast<size_t>(candidate->sdp_mline_index());
size_t remote_content_size =
BaseSession::remote_description()->contents().size();
if (mediacontent_index >= remote_content_size) {
LOG(LS_ERROR)
<< "UseRemoteCandidateInSession: Invalid candidate media index.";
return false;
}
cricket::ContentInfo content =
BaseSession::remote_description()->contents()[mediacontent_index];
std::vector<cricket::Candidate> candidates;
candidates.push_back(candidate->candidate());
// Invoking BaseSession method to handle remote candidates.
std::string error;
if (OnRemoteCandidates(content.name, candidates, &error)) {
// Candidates successfully submitted for checking.
if (ice_connection_state_ == PeerConnectionInterface::kIceConnectionNew ||
ice_connection_state_ ==
PeerConnectionInterface::kIceConnectionDisconnected) {
// If state is New, then the session has just gotten its first remote ICE
// candidates, so go to Checking.
// If state is Disconnected, the session is re-using old candidates or
// receiving additional ones, so go to Checking.
// If state is Connected, stay Connected.
// TODO(bemasc): If state is Connected, and the new candidates are for a
// newly added transport, then the state actually _should_ move to
// checking. Add a way to distinguish that case.
SetIceConnectionState(PeerConnectionInterface::kIceConnectionChecking);
}
// TODO(bemasc): If state is Completed, go back to Connected.
} else {
LOG(LS_WARNING) << error;
}
return true;
}
void WebRtcSession::RemoveUnusedChannelsAndTransports(
const SessionDescription* desc) {
const cricket::ContentInfo* voice_info =
cricket::GetFirstAudioContent(desc);
if ((!voice_info || voice_info->rejected) && voice_channel_) {
mediastream_signaling_->OnAudioChannelClose();
SignalVoiceChannelDestroyed();
const std::string content_name = voice_channel_->content_name();
channel_manager_->DestroyVoiceChannel(voice_channel_.release());
DestroyTransportProxy(content_name);
}
const cricket::ContentInfo* video_info =
cricket::GetFirstVideoContent(desc);
if ((!video_info || video_info->rejected) && video_channel_) {
mediastream_signaling_->OnVideoChannelClose();
SignalVideoChannelDestroyed();
const std::string content_name = video_channel_->content_name();
channel_manager_->DestroyVideoChannel(video_channel_.release());
DestroyTransportProxy(content_name);
}
const cricket::ContentInfo* data_info =
cricket::GetFirstDataContent(desc);
if ((!data_info || data_info->rejected) && data_channel_) {
mediastream_signaling_->OnDataChannelClose();
SignalDataChannelDestroyed();
const std::string content_name = data_channel_->content_name();
channel_manager_->DestroyDataChannel(data_channel_.release());
DestroyTransportProxy(content_name);
}
}
// TODO(mallinath) - Add a correct error code if the channels are not creatued
// due to BUNDLE is enabled but rtcp-mux is disabled.
bool WebRtcSession::CreateChannels(const SessionDescription* desc) {
// Disabling the BUNDLE flag in PortAllocator if offer disabled it.
bool bundle_enabled = desc->HasGroup(cricket::GROUP_TYPE_BUNDLE);
if (state() == STATE_INIT && !bundle_enabled) {
port_allocator()->set_flags(port_allocator()->flags() &
~cricket::PORTALLOCATOR_ENABLE_BUNDLE);
}
// Creating the media channels and transport proxies.
const cricket::ContentInfo* voice = cricket::GetFirstAudioContent(desc);
if (voice && !voice->rejected && !voice_channel_) {
if (!CreateVoiceChannel(voice)) {
LOG(LS_ERROR) << "Failed to create voice channel.";
return false;
}
}
const cricket::ContentInfo* video = cricket::GetFirstVideoContent(desc);
if (video && !video->rejected && !video_channel_) {
if (!CreateVideoChannel(video)) {
LOG(LS_ERROR) << "Failed to create video channel.";
return false;
}
}
const cricket::ContentInfo* data = cricket::GetFirstDataContent(desc);
if (data_channel_type_ != cricket::DCT_NONE &&
data && !data->rejected && !data_channel_.get()) {
if (!CreateDataChannel(data)) {
LOG(LS_ERROR) << "Failed to create data channel.";
return false;
}
}
return true;
}
bool WebRtcSession::CreateVoiceChannel(const cricket::ContentInfo* content) {
voice_channel_.reset(channel_manager_->CreateVoiceChannel(
this, content->name, true));
return (voice_channel_ != NULL);
}
bool WebRtcSession::CreateVideoChannel(const cricket::ContentInfo* content) {
video_channel_.reset(channel_manager_->CreateVideoChannel(
this, content->name, true, voice_channel_.get()));
return (video_channel_ != NULL);
}
bool WebRtcSession::CreateDataChannel(const cricket::ContentInfo* content) {
bool rtcp = (data_channel_type_ == cricket::DCT_RTP);
data_channel_.reset(channel_manager_->CreateDataChannel(
this, content->name, rtcp, data_channel_type_));
if (!data_channel_.get()) {
return false;
}
data_channel_->SignalDataReceived.connect(
this, &WebRtcSession::OnDataReceived);
return true;
}
void WebRtcSession::CopySavedCandidates(
SessionDescriptionInterface* dest_desc) {
if (!dest_desc) {
ASSERT(false);
return;
}
for (size_t i = 0; i < saved_candidates_.size(); ++i) {
dest_desc->AddCandidate(saved_candidates_[i]);
delete saved_candidates_[i];
}
saved_candidates_.clear();
}
// Look for OPEN messages and set up data channels in response.
void WebRtcSession::OnDataReceived(
cricket::DataChannel* channel,
const cricket::ReceiveDataParams& params,
const talk_base::Buffer& payload) {
if (params.type != cricket::DMT_CONTROL) {
return;
}
std::string label;
DataChannelInit config;
if (!mediastream_signaling_->ParseDataChannelOpenMessage(
payload, &label, &config)) {
LOG(LS_WARNING) << "Failed to parse data channel OPEN message.";
return;
}
config.negotiated = true; // This is the negotiation.
if (!mediastream_signaling_->AddDataChannelFromOpenMessage(
label, config)) {
LOG(LS_WARNING) << "Failed to create data channel from OPEN message.";
return;
}
}
// Returns false if bundle is enabled and rtcp_mux is disabled.
bool WebRtcSession::ValidateBundleSettings(const SessionDescription* desc) {
bool bundle_enabled = desc->HasGroup(cricket::GROUP_TYPE_BUNDLE);
if (!bundle_enabled)
return true;
const cricket::ContentGroup* bundle_group =
desc->GetGroupByName(cricket::GROUP_TYPE_BUNDLE);
ASSERT(bundle_group != NULL);
const cricket::ContentInfos& contents = desc->contents();
for (cricket::ContentInfos::const_iterator citer = contents.begin();
citer != contents.end(); ++citer) {
const cricket::ContentInfo* content = (&*citer);
ASSERT(content != NULL);
if (bundle_group->HasContentName(content->name) &&
!content->rejected && content->type == cricket::NS_JINGLE_RTP) {
if (!HasRtcpMuxEnabled(content))
return false;
}
}
// RTCP-MUX is enabled in all the contents.
return true;
}
bool WebRtcSession::HasRtcpMuxEnabled(
const cricket::ContentInfo* content) {
const cricket::MediaContentDescription* description =
static_cast<cricket::MediaContentDescription*>(content->description);
return description->rtcp_mux();
}
bool WebRtcSession::ValidateSessionDescription(
const SessionDescriptionInterface* sdesc,
cricket::ContentSource source, std::string* error_desc) {
if (error() != cricket::BaseSession::ERROR_NONE) {
return BadSdp(source, SessionErrorMsg(error()), error_desc);
}
if (!sdesc || !sdesc->description()) {
return BadSdp(source, kInvalidSdp, error_desc);
}
std::string type = sdesc->type();
Action action = GetAction(sdesc->type());
if (source == cricket::CS_LOCAL) {
if (!ExpectSetLocalDescription(action))
return BadSdp(source, BadStateErrMsg(type, state()), error_desc);
} else {
if (!ExpectSetRemoteDescription(action))
return BadSdp(source, BadStateErrMsg(type, state()), error_desc);
}
// Verify crypto settings.
if (webrtc_session_desc_factory_->secure() == cricket::SEC_REQUIRED &&
!VerifyCrypto(sdesc->description())) {
return BadSdp(source, kSdpWithoutCrypto, error_desc);
}
if (!ValidateBundleSettings(sdesc->description())) {
return BadSdp(source, kBundleWithoutRtcpMux, error_desc);
}
// Verify m-lines in Answer when compared against Offer.
if (action == kAnswer) {
const cricket::SessionDescription* offer_desc =
(source == cricket::CS_LOCAL) ? remote_description()->description() :
local_description()->description();
if (!VerifyMediaDescriptions(sdesc->description(), offer_desc)) {
return BadSdp(source, kMlineMismatch, error_desc);
}
}
return true;
}
bool WebRtcSession::ExpectSetLocalDescription(Action action) {
return ((action == kOffer && state() == STATE_INIT) ||
// update local offer
(action == kOffer && state() == STATE_SENTINITIATE) ||
// update the current ongoing session.
(action == kOffer && state() == STATE_RECEIVEDACCEPT) ||
(action == kOffer && state() == STATE_SENTACCEPT) ||
(action == kOffer && state() == STATE_INPROGRESS) ||
// accept remote offer
(action == kAnswer && state() == STATE_RECEIVEDINITIATE) ||
(action == kAnswer && state() == STATE_SENTPRACCEPT) ||
(action == kPrAnswer && state() == STATE_RECEIVEDINITIATE) ||
(action == kPrAnswer && state() == STATE_SENTPRACCEPT));
}
bool WebRtcSession::ExpectSetRemoteDescription(Action action) {
return ((action == kOffer && state() == STATE_INIT) ||
// update remote offer
(action == kOffer && state() == STATE_RECEIVEDINITIATE) ||
// update the current ongoing session
(action == kOffer && state() == STATE_RECEIVEDACCEPT) ||
(action == kOffer && state() == STATE_SENTACCEPT) ||
(action == kOffer && state() == STATE_INPROGRESS) ||
// accept local offer
(action == kAnswer && state() == STATE_SENTINITIATE) ||
(action == kAnswer && state() == STATE_RECEIVEDPRACCEPT) ||
(action == kPrAnswer && state() == STATE_SENTINITIATE) ||
(action == kPrAnswer && state() == STATE_RECEIVEDPRACCEPT));
}
} // namespace webrtc